I had the same journal problem, so now I (try) to go through the past week of journal entries every week and pull out the parts I find important/useful , and create a digital weekly review page that I go back and skim over.
I'm trying to make my journal a less of a write it and forget it type of place, and more of a starting point for ideas. Use the journal as a playground, and then come through and curate out the good ideas into a more long term location.
"write it and forget It"
Oh, that's exactly my problem :) So you review and summarize/reduce?